Christopher Allen

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This article is based on iPhone in Action, to be published January 2009. It is being reproduced here by permission from Manning Publications. Manning early access books and ebooks are sold exclusively through Manning. Visit the book's page for more information. The iPhone's accelerometers can provide access to a variety of information about where an iPhone exists in space. By measuring gravity, you can easily discover an iPhone's precise orientation. By measuring movement, you can see how an iPhone is being guided through space. Further, you can build more complex movements into three-dimensional gestures, such as the shake. Although we usually think about the iPhone's touch screen in reference to input, the accelerometers provide another method that could allow users to make simple adjustments to a program. We can imagine game controls and painting programs both bu... (more)